CN105580455A - A receivier and method for estimating large-scale channel properties - Google Patents
A receivier and method for estimating large-scale channel properties Download PDFInfo
- Publication number
- CN105580455A CN105580455A CN201380079767.1A CN201380079767A CN105580455A CN 105580455 A CN105580455 A CN 105580455A CN 201380079767 A CN201380079767 A CN 201380079767A CN 105580455 A CN105580455 A CN 105580455A
- Authority
- CN
- China
- Prior art keywords
- channel
- transmitter
- signal
- receiver
- characteristic
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L25/00—Baseband systems
- H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
- H04L25/0202—Channel estimation
- H04L25/0224—Channel estimation using sounding signals
- H04L25/0228—Channel estimation using sounding signals with direct estimation from sounding signals
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/24—Radio transmission systems, i.e. using radiation field for communication between two or more posts
- H04B7/26—Radio transmission systems, i.e. using radiation field for communication between two or more posts at least one of which is mobile
- H04B7/2612—Arrangements for wireless medium access control, e.g. by allocating physical layer transmission capacity
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L25/00—Baseband systems
- H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
- H04L25/03—Shaping networks in transmitter or receiver, e.g. adaptive shaping networks
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W56/00—Synchronisation arrangements
- H04W56/001—Synchronization between nodes
- H04W56/0015—Synchronization between nodes one node acting as a reference for the others
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W56/00—Synchronisation arrangements
- H04W56/001—Synchronization between nodes
- H04W56/002—Mutual synchronization
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W84/00—Network topologies
- H04W84/18—Self-organising networks, e.g. ad-hoc networks or sensor networks
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W84/00—Network topologies
- H04W84/02—Hierarchically pre-organised networks, e.g. paging networks, cellular networks, WLAN [Wireless Local Area Network] or WLL [Wireless Local Loop]
- H04W84/10—Small scale networks; Flat hierarchical networks
- H04W84/12—WLAN [Wireless Local Area Networks]
Abstract
A receiver and a method performed by the receiver for estimating first large-scale channel properties associated to a first channel of a first transmitter and a second large-scale channel properties associated to a second channel of a second transmitter are provided. The method comprises receiving (110) a first signal transmitted by the first transmitter and further receiving at least a second signal transmitted by the second transmitter, wherein the first and the second transmitter are synchronised to a common synchronisation reference, and wherein the first signal and/or the second signal comprises at least one reference signal. The method further comprises jointly estimating (120) the first and second large-scale channel properties based on the at least one reference signal; and associating (130) the jointly estimated large-scale channel properties to the first channel associated to the first transmitter and to the second channel associated to the second transmitter.
Description
Technical field
Present disclosure relates to the communication between transmitter and receiver, and in particular to estimation large scale (large-scale) characteristic of channel so that make the communication between transmitter and receiver become possibility.
Background technology
Device-to-device D2D communication is the known of many existing wireless technologys (comprising adhoc network) and widely used part.Example comprises some modification of bluetooth and Institute of Electrical and Electric Engineers IEEE802.11 standard group, and such as WiFi leads directly to.These systems operate in unlicensed frequency spectrum.
Recently, the D2D communication as the bottom (underlay) of cellular network has been suggested as utilizing the proximity of communication equipment and allow equipment to carry out the means operated in controlled interference environment simultaneously.Usually, advise that such D2D communication is such as by being preserved for D2D object to share the frequency spectrum identical with cellular system by some cellular uplink resources.Distributing special frequency spectrum for D2D object is the more impossible substitute mode of one, because frequency spectrum is a kind of scarce resource and between D2D service with cellular service, (dynamically) is shared is more flexibly and provides higher spectrum efficiency.
Want to carry out each other communicating or even just find that equipment each other needs to launch various forms of control signal usually.An example of this control signal is so-called (discovery) beacon signal, and it at least carries the mark of certain form and is launched by the findable equipment of other equipment by wanting to become.Other equipment can scan to find this beacon signal.Once they detect this beacon, they just can take suitable action, such as, attempt initiating the connection establishment with the equipment launching this beacon.For some communication pattern (such as, connectionless communication, is used usually for multicast and broadcasting transmitting), beacon signal can carry scheduling assignment, and scheduling assignment indicates the transfer of data be associated to potential receiver.Normally a kind of one-way communication mode not requiring the connection establishment through confirming of connectionless communication.Other forms of control signal also can be carried by beacon channel.
Also may desirably, for outside the network coverage user equipment (UE) support D2D operation.In such a case, different synchronous selections may be had: UE can be synchronized to universal reference (such as, global position system GPS), and it is generally different from the reference synchronization of institute's on-premise network.It is possible that the mode (at least for discovery, not having reference synchronization) that UE can be finished disparate step operates.Selection be in addition the cluster synchronization of UE to particular UE (hereinafter referred to cluster head CH), this particular UE provides local synchronization to its neighbours UE.Different clusters is uninevitable by synchronously.May further desirably, support the discovery scene of minizone, wherein quarter at and may can find each other by the UE on not synchronous community.
In addition, between different districts (they may be just not synchronous or have large propagation delay), operate D2D may require directly synchronous what participate between the UE in D2D communication.
May not synchronous beacon and perform channel estimating in order to detect, if radio transmission techniques adopts Long Term Evolution LTE, then each beacon is provided with demodulated reference signal DMRS.DMRS in each beacon is mapped to one or more OFDM symbol.Each DMRS is generated from the known array (such as, such sequence derives from Zaduff-Chu sequence) with good autocorrelation performance and their cross correlation.
Even if various selection may be had, but for beacon is mapped to radio frame a kind of may solution be in selected subframe in a frequency domain multiplexing (frequency division multiplexing FDM) from the beacon of different UEs.
Beacon is feature (1 such as, corresponding with 12 subcarriers in LTE Physical Resource Block PRB) usually with narrow bandwidth.Even with the reliable estimation also obtaining timing and the Doppler frequency shift be associated with each beacon in order to the low signal noise ratio SNR required by beacon detection, mean the remarkable DMRS expense in each beacon.Such expense decrease potential be assigned to the resource element of the payload of beacon number and because this increasing beacon-code rate, thus have impact on the covering of beacon.
Summary of the invention
Object is at least some problem will eliminated in problem summarized above.Especially, an object is to provide a kind of receiver and is performed the method for the first yardstick characteristic of channel be associated with the first channel of the first transmitter for estimation and the second largest yardstick characteristic of channel be associated with the second channel of the second transmitter by this receiver.These objects and other objects can obtain according to the receiver of hereafter appended independent claims and the method that performed by receiver by providing.
According to an aspect, provide a kind of method being performed the first yardstick characteristic of channel be associated with the first channel of the first transmitter for estimation and the second largest yardstick characteristic of channel be associated with the second channel of the second transmitter by receiver.The method comprises: receive by the first signal of the first transmitter transmitting and at least receive the secondary signal of being launched by the second transmitter further, wherein the first and second transmitters are synchronized to common reference synchronization, and wherein the first signal and/or secondary signal comprise at least one reference signal.The method comprises further: carry out the Combined estimator first and second large scale characteristic of channel based on this at least one reference signal; And the large scale characteristic of channel of Combined estimator be associated with the first channel of being associated with the first transmitter and be associated with the second channel be associated with the second transmitter.
According to an aspect, a kind of receiver is adapted to estimate the first yardstick characteristic of channel be associated with the first channel leading to the first transmitter and the second largest yardstick characteristic of channel be associated with the second channel of the second transmitter.This receiver comprises: receiving element, be adapted to receive by the first signal of the first transmitter transmitting and be further used at least receiving the secondary signal of being launched by the second transmitter, wherein the first and second transmitters are synchronized to common reference synchronization, and wherein the first signal and/or secondary signal comprise at least one reference signal.This receiver comprises further: estimation unit, is adapted to carry out the Combined estimator first and second large scale characteristic of channel based on this at least one reference signal; And associative cell, be adapted to the large scale characteristic of channel of Combined estimator to be associated with the first channel of being associated with the first transmitter and be associated with the second channel be associated with the second transmitter.
This receiver and the method performed by this receiver can have some advantages.A kind of possible advantage is, this receiver by also considering the reference signal of other (multiple) signals received except the first received signal, can improve the estimation of the large scale characteristic of channel joined with the first received signal correction.Another possible advantage is, transmitter can not need in order to as many reference signal can be incorporated in the signal that is launched the channel be launched by it estimates the large scale characteristic of channel at signal by this receiver rightly.
Accompanying drawing explanation
In more detail embodiment will be described about accompanying drawing now, in the accompanying drawings:
Fig. 1 a is the flow chart being performed the method for the first yardstick characteristic of channel be associated with the first channel of the first transmitter for estimation by receiver according to a kind of exemplary embodiment.
Fig. 1 b is the flow chart being performed the method for the first yardstick characteristic of channel be associated with the first channel of the first transmitter for estimation by receiver according to another exemplary embodiment.
Fig. 1 c performs flow chart for the method estimating the first yardstick characteristic of channel be associated with the first channel of the first transmitter according to an exemplary embodiment again by receiver.
Fig. 2 a is the indicative icon finding that the FDM of beacon/signal maps.
Fig. 2 b is a kind of example of the DMRS resource mapping of function as signal resource index.
Fig. 2 c is the another example of the DMRS resource mapping of function as signal resource index.
Fig. 2 d is an example again of the DMRS resource mapping of function as signal resource index.
Fig. 2 e is the block diagram of the Combined estimator schematically illustrating the large scale characteristic of channel.
Fig. 3 is the block diagram being adapted to the receiver estimating the first yardstick characteristic of channel be associated with the first channel of the first transmitter according to a kind of exemplary embodiment.
Fig. 4 is the block diagram being adapted to the layout of the receiver estimating the first yardstick characteristic of channel be associated with the first channel of the first transmitter according to a kind of exemplary embodiment.
Embodiment
In brief, provide a kind of receiver and performed the method for the first yardstick characteristic of channel be associated with the first channel of the first transmitter for estimation and the second largest yardstick characteristic of channel be associated with the second channel of the second transmitter by this receiver.The method and this receiver utilize the secondary signal received from the second transmitter, and based on received one of the first signal and secondary signal or in both at least one included reference signal carry out Combined estimator first and second large scale characteristic.
Describe a kind of exemplary embodiment of this method referring now to Fig. 1 a, Fig. 1 a is the flow chart being performed the method for the first yardstick characteristic of channel be associated with the first channel of the first transmitter for estimation and the second largest yardstick characteristic of channel be associated with the second channel of the second transmitter by receiver according to a kind of exemplary embodiment.
Fig. 1 a illustrates the method, the method comprises: receive 110 the first signals launched by the first transmitter and at least receive the secondary signal of being launched by the second transmitter in addition, wherein the first and second transmitters are synchronized to common reference synchronization, and wherein the first signal and/or secondary signal comprise at least one reference signal.The method comprises further: carry out the Combined estimator 120 first and second large scale characteristic of channel based on this at least one reference signal; And the large scale characteristic of channel of Combined estimator association 130 is associated with to the first channel be associated with the first transmitter the second channel be associated with the second transmitter.
Receiver can receive the signal launched from multiple transmitter.Each transmitter is transmitted by corresponding channel.Receiver receives at least two signals, the first signal namely launched by the first transmitter respectively by the first and second channels and the secondary signal by the second transmitter transmitting.First and second transmitters are synchronized to common reference synchronization.Receiver never can be synchronized to the other transmitter Received signal strength of this common reference synchronization, and if like this, these signals can be dropped simply.By common reference synchronization, mean time and/or frequency alignment.This reference synchronization can be provided by such as radio base station, eNodeB, base station controller, radio network controller etc.This reference synchronization can also be provided by such as transmitter, receiver, mobile radio station, subscriber equipment etc.
It should be noted that, receiver can also receive the 3rd signal by the 3rd channel from the 3rd transmitter, receive the 4th signal etc. by the 4th channel from the 4th transmitter, wherein the third and fourth transmitter is synchronized to the reference synchronization identical with the first and second transmitters.But the exemplary embodiment of the method henceforth will only be described with two transmitters explicitly.Further, channel refers to propagation channel (contrast LTE term " physical channel for transfer of data etc. ").
First signal and/or secondary signal comprise at least one reference signal.
The method also comprises: carry out the Combined estimator first and second large scale characteristic of channel based on this at least one reference signal.Several examples of the large scale characteristic of channel are propagation delay and Doppler frequency shift.Because the first and second transmitters are both synchronized to common reference synchronization, so some large scale characteristic of the first channel can be assumed to be the large scale characteristic being similar to second channel.Such as, if the first and second signals both comprise a corresponding reference signal, then by carrying out the Combined estimator first and second large scale characteristic of channel based on these two reference signals, the estimation more accurately of the large scale characteristic of channel for both the first and second channels can be obtained.In another example, if the only signal in signal comprises a reference signal, such as the first signal, then the large scale characteristic of channel of second channel can be estimated as the large scale characteristic of channel the same as or similar to the first channel, because the first and second transmitters are synchronized to common reference synchronization.Certainly, both the first and second signals are each can comprise more than one reference signal, but at least one signal in the first and second signals received comprises at least one reference signal.In another example, even if the first and second signals both comprise a corresponding reference signal, then the large scale characteristic of channel of second channel can be estimated as the large scale characteristic of channel the same as or similar to the first channel, because the first and second transmitters are synchronized to common reference synchronization.By this way, if only adopt the reference signal corresponding with the first transmitter to be used for the channel estimating of some large scale characteristic of channel, then the complexity of channel estimating is reduced.
Generally speaking, channel estimating can be divided into the step estimating some large scale characteristic of channel, is the step estimating actual channel in time domain or frequency domain or other territories subsequently.The large scale characteristic of channel can be utilized, such as, for optimizing to estimate the estimated parameter that actual channel uses.With the estimation of actual channel, if herein it is intended that such as perform estimation in the time domain, be then the estimation to time domain channel taps (tap), if or perform estimation in a frequency domain, be then the estimation to frequency response.
The method comprises further: the large scale characteristic of channel of Combined estimator is associated with the first channel be associated with the first transmitter, and is associated with the second channel be associated with the second transmitter.
By this way, likely such as minimize the number of the reference signal of each signal, make receiver can pass through also to consider the reference signal of other signals received/another signal received because carry out the Combined estimator first and second large scale characteristic of channel based on this at least one reference signal, estimate the large scale characteristic of channel for such as the first channel, all these signals received all sent by the individual transmitter being synchronized to common reference synchronization.In fact, being intended to exceed the hypothesis large scale characteristic of channel in reference signal is known make it possible to estimate the large scale characteristic of channel to the estimation of actual channel, and reference signal may have additional designing requirement.This additional designing requirement may cause expense and the power consumption of increase.
The method has some advantages.A kind of advantage is, receiver by also considering the reference signal of other (multiple) signals received except the first received signal, can improve the estimation of the large scale characteristic of channel joined with the first received signal correction.Another advantage is, transmitter can not need in order to as many reference signal can be incorporated in the signal that is launched the channel be launched by it estimates the large scale characteristic of channel at signal by receiver rightly.
According to a kind of embodiment illustrated in Fig. 1 b, the method comprises further: based on the large scale characteristic of channel of the Combined estimator be associated, by receiver synchronous with the first transmitter 150.
Once the large scale characteristic of channel of Combined estimator has been associated with the first channel of being associated with the first transmitter and has been associated with the second channel be associated with the second transmitter by receiver, receiver just based on the Combined estimator be associated the large scale characteristic of channel by it oneself synchronous with the first transmitter.By this way, receiver can be communicated with the first transmitter, and receiver can correctly receive the signal launched by transmitter, because receiver such as Doppler frequency shift and/or average retardation that it is now know that is associated by the channel that it carries out communicating with transmitter and receiver.
The method may further include, illustrated in Fig. 1 c, the large scale characteristic of channel based on the Combined estimator be associated determines 140 reference synchronizations.
By this way, receiver it is now know that the reference synchronization identical with common reference synchronization.
According to a kind of embodiment, the first and second large scale characteristics of channel comprise following one or more: such as, postpone expansion, doppler spread, Doppler frequency shift, average gain, average retardation and other large scale characteristics of channel.
First and second channels depend on the path between corresponding transmitter and receiver.If the first and second transmitters are positioned in two individual positions, then corresponding respective paths between transmitter from receiver can be different.First, the distance between the first transmitter and receiver can be different from the distance between the second transmitter and receiver.Secondly, compared in the path between the second transmitter and receiver, may there is different barriers and/or environment from the path between receiver in the first transmitter.In addition, the first and second transmitters may have different reference timings and/or frequency reference.All of these factors taken together, and there is no the more multifactor of description, may differently affect the first and second channels.Therefore, compared to the secondary signal of launching from the second transmitter to receiver, the first signal launched from the first transmitter to receiver may suffer different doppler spreads, Doppler frequency shift, average gain and/or average retardation, if especially two corresponding paths are very different.All these different factors are examples of the large scale characteristic of channel.If the distance between the first transmitter and receiver and the distance between the second transmitter and receiver are similar; And/or first the path between transmitter and receiver and the path between the second transmitter and receiver be similar; And if the first transmitter and the second transmitter are synchronized to the identical reference synchronization in time and/or frequency, then the large scale characteristic of the first channel can be similar to the large scale characteristic of second channel.
According to another embodiment, receiver synchronous with the first transmitter 150 is comprised: timing and/or the Frequency Synchronization of estimating the first signal.
When receiver is based on this at least one reference signal Combined estimator during the first and second large scale characteristics of channel, receiver can estimate the timing between its oneself and first transmitter and/or the difference in frequency.Once receiver have estimated the difference in timing and/or frequency, just make receiver can by it oneself synchronous with the first transmitter, namely it regularly can to align its transmitting and/or receiving parameter according to reference.
According to an embodiment again, the joint channel estimation of the described first and second large scale characteristics of channel is utilized to perform demodulation to the data that the first and/or second transmitter is launched.
When receiver receives from the first and/or second transmitter the signal comprising data subsequently, the signal that receiver needs demodulation to receive.First and second transmitters perform the modulation of certain kind when transmitting.Therefore receiver utilizes the first and second large scale characteristics of channel of Combined estimator, so that the data that demodulation is launched by the first and/or second transmitter.At least one reference signal that at least one signal in the first and second signals received used in order to the Combined estimator large scale characteristic of channel comprises, can be used to the signal comprising data that demodulation receives subsequently.The indicative icon of this embodiment is illustrated in Fig. 2 e.
According to a kind of embodiment, the method comprises further: based on pre-configured, based on the signaling received from network or transmitter or based on the analysis to received first and at least secondary signal, determine that some the large scale characteristic joined with some signal correction is identical.
Receiver can be preconfigured the information belonging to different channels, and such as, some the large scale characteristic joined with some signal correction is identical.By this way, the estimation of the large scale characteristic of channel of such as the first channel can be performed more accurately.Alternatively, or additionally, the network that receiver can be connected to from receiver or from such as comprise the information belonging to different channels first or second transmitter receive signaling, such as, some the large scale characteristic joined with some signal correction is identical.Further, receiver can be analyzed or anticipate received signal in advance and analyze in advance based on this or analyze in advance and obtain the information belonging to different channels, and such as, some the large scale characteristic joined with some signal correction is identical.
The method can be adopted by the receiver that can receive the signal launched by means of different lift-off technology.Such as, receiver can receive the signal launched by means of orthogonal frequency division multiplex OFDM, time division multiplexing tdm and/or code division multiplexing CDM.
Transmitter and receiver can be both the user equipment (UE) of a type, user equipment (UE) so can be following any one: such as, mobile phone, mobile radio station, laptop computer, personal digital assistant or any other equipment of communicating or terminal can be carried out by means of radio and another equipment or terminal.
Hereafter followed the example that Receiver And Transmitter is the UE be operable in wireless communication system, wireless communication system comprises the radio base station (RBS) or eNodeB (eNB) with the territory, respective coverage areas being also referred to as community.In example hereafter, also reference is made to cluster.Cluster comprises the UE of shared common reference synchronization.Therefore, all UE quartering at same cells (that is, being connected to identical eNB or RBS) or belong to same cluster share common reference synchronization.Common reference synchronization can be provided by eNB or RBS, or is provided by the UE serving as reference synchronization in cluster.The UE serving as reference synchronization in cluster is also referred to as cluster head CH.In addition in example hereafter, lift-off technology is FDM, and wherein wireless communication system can be Long Term Evolution LTE communication system.Or see Fig. 2 a.
Typical propagation in each community or cluster postpones to be the magnitude of microsecond, and owing to Doppler frequency shift and synchronous error combination caused by Typical frequency error (compared to eNB or UE carrier frequency) be the centesimal magnitude of the part of every 1,000,000 of carrier frequency, i.e. hundreds of Hz.In order to realize satisfied performance, UE needs in considerably less microsecond, (if that is, UE is operable in LTE communication system, to be then less than circulating prefix-length) and the hundreds of Hz of reference synchronization apart from them carries out synchronously.
But, different reference synchronization may any simultaneous bias of (different UEs of wherein serving as CH can be different with thousands of Hz on a carrier frequency) in (such as, dispose for not synchronous FDD and for different clusters) and/or frequency in elapsed-time standards.In order to the UE quartered on different districts or cluster be detected, the UE carrying out receiving needs to estimate and solves the potential timing/frequency shift (FS) greatly joined with these signal corrections.This estimation can based on the demodulated reference signal DMRS for this signal.
Here observe, the simultaneous bias be associated with the UE quartered on given community or cluster with two compositions for feature.(1) large timing and/or frequency shift (FS), owing to any reference synchronization supposed by eNB or CH.This large skew is common to all UE quartered on same cells/cluster.Typical skew is the magnitude of millisecond (time) or kHz (frequency).(2) little timing and/or frequency shift (FS), owing to the specific propagation delay of UE and mobility and owing to synchronous error.This skew is that UE is specific.Typical skew is the magnitude of microsecond (time) or hundreds of Hz (frequency).
When talking about timing estimation, the reference bandwith (such as, 1 Physical Resource Block PRB) of signal is enough for obtaining the resolution of some microseconds with moderate signal noise ratio SNR value.But the accidental decline owing to such as channel is prominent falls into (fadingdip) and accidental interference burst, and receiver may can not estimate timing by accident in desired accuracy.
Also can be derived for Frequency Estimation the similar consideration of timing estimation.Usually by estimating that the phase rotating of the channel between two or more DMRS of launching in different OFDM symbol obtains frequency shift (FS).As General Principle, close DMRS allows wide estimation range, and width allows the resolution of improvement for given SNR value from the DMRS separated.As a kind of example, provided by +/-1 (2dT) by the estimation range of the phase compare to two continuous DMRS, wherein dT is the time interval between DMRS.In order to estimate the frequency shift (FS) in the scope (this is necessary for device-to-device D2D operation) of about +/-7kHz, DMRS needs two the continuous OFDM symbol being mapped to interval ~ 72us.
Therefore, spaced apart for DMRS itself (byitself) is not used to the applicable solution improving signal frequency estimation.
Timing estimation and the performance both Frequency Estimation can be improved by the number increasing the DMRS of every signal, and this is covered as cost with the payload of expense and reduction and signal.
Another example how improving the estimation of the large scale parameter (wherein propagation delay and Doppler frequency shift are two examples of this parameter) for these signals makes UE launch reliable special synchronous signal, such as with DMRS differently, this special synchronous signal is not directly associated with transfer of data.This synchronizing signal can have the bandwidth sum cycle different with corresponding data field from DMRS, and so can be more suitable for for synchronous object.Each UE can launch the synchronizing signal of its individuality, has specific burst and mark, or multiple UE (such as, sharing all UE of identical reference synchronization) can launch identical synchronizing signal by the radio resource shared.In the later case, multiple identical synchronizing signal is launched with overlap mode by the predefine set of radio resource.Suppose that the relevance between synchronizing signal and other signals known by receiver, then some large scale characteristic of channel (such as, propagation delay and Doppler frequency shift) can be assumed to be between these synchronizing signals and the radio channel of these other signal correction connection be accurate location (QuasiCo-Located) altogether, QCL.In this case, receiver can estimate such large scale characteristic of channel (that is, time of implementation and/or Frequency Synchronization) from these synchronizing signals, and by such synchronous applications to these other signals.DMRS alternatively from these signals estimates by the actual channel joined with these other signal corrections, because such characteristic will not be QCL with other reference signals of such as synchronizing signal.Owing to the reliable synchronization based on special synchronous signal, this QCL supposes the channel estimating alleviated based on signal DMRS and the expense that may allow in signal reduces.
Antenna port QCL is that a kind of first working in coordination with at down link DL in the context of multiple spot CoMP issues at the 3rd generation partner program 3GPPLTE the framework introduced in-11.In DLCoMP, the unlike signal being target with given UE can be launched from the antenna (antenna port) be spatially separated network with channel, and is therefore associated with different propagation radio channels.It should be noted that the imperfection of transmitter is included in equivalent channel.The geography of reference signal RS port is separated and means that the transient channel coefficient from each port towards UE is generally different.In addition, even may be different significantly for the statistical property (being sometimes equivalently called " long-term channel characteristics " or " the large scale characteristic of channel ") of the channel of different port and RS type.The example of this statistical property comprise for each port received power, postpone expansion, doppler spread, reception regularly (that is, the timing of first effective (significant) channel tap), the number of efficient channel tap, frequency displacement.In LTE, based on the characteristic of the channel of another antenna port, nothing can by the characteristic supposing to have about the channel corresponding with antenna port.This is in fact the key component maintaining the transmission transparency.
Some antenna port can be associated with identical (that is, similar substantially) large scale characteristic of channel.In this case, it is said that given antenna port is accurate location altogether about some large scale characteristic of channel.Generally speaking, for often pair of RS port and in the given time, two conditions can be possible below.(1) port A and B can be assumed to be about large scale characteristic X by (UE) is QCL.(2) port A and B should be assumed to be about large scale characteristic X by (UE) is QCL.
Method disclosed above allow for the synchronous of the signal of improvement for the DMRS expense of given every signal.A kind of hypothesis is that multiple signal is often launched in same cells or cluster by multiple UE.These concurrent transmittings may occur in (as in the FDM situation being considered baseline in this description) and employing TDM or CDM mode in identical subframe, and do not affect the applicability of the receiver of the method or execution the method.
QCL hypothesis as described herein easily can expand to any signal and/or channel launched by UE, comprise such as immediate data channel and discovery channel, find that channel is launched by UE in order to D2D object and is associated with the reference synchronization identical with these signals and/or synchronizing signal.
Receiver (or carry out receive UE) estimates timing and/or Frequency Synchronization based on the DMRS received joined with multiple signal correction for Setting signal.The signal of united process can be selected based on following information: these signals are associated with the UE that quarters on same cells or cluster and therefore have common reference synchronization.In addition, the one or more synchronous reference signals can launched by the one or more UE sharing identical reference synchronization can be utilized in Combined estimator.Algorithm for estimating jointly processes the corresponding signal of the DMRS that launches in corresponding multiple signals to multiple UE.Viewed, receiver is not inevitable a priori know launched signal and be present in practically in the resource that uses to estimate.It is possible that when be intended to signal is not launched, some DMRS signals may only comprise noise or interference.Estimated reference synchronization or the large scale characteristic of channel can be utilized as the input parameter of the channel estimation method for these signals.
Example above allows receiver to utilize multiple DMRS for estimating that all signals (in certain scope or accuracy) launched the UE in community/cluster are common parameters.Can by utilize based on the DMRS joined with each signal correction estimation, carry out refinement (refine) Combined estimator based on multiple signal, to obtain the fine estimation to the large scale characteristic of channel.
A kind of practicality example occurs together with mapping with the FDM of signal.In this case, receiver knows that some signals are multiplexed in identical subframe with high probability, and can realize at least rough time and/or Frequency Synchronization for the multiple beacon resource joints in identical subframe, therefore utilizes multiple DMRS.
A kind of equivalents setting forth example be above say that receiver UE can suppose to be associated with the UE with identical reference synchronization with some large scale characteristic of channel being used to pass on the antenna port of signal to be associated and may having other reference signals between be QCL.These characteristics of channel can be following one or more: such as, postpone expansion, doppler spread, Doppler frequency shift, average gain and average retardation.
In order to make as in foregoing embodiments the Combined estimator of synchronization parameter discussed become possibility, receiver can utilize the knowledge of parameter relevant for following signal, and these signals comprise and the DMRS signal correction of united process potentially joined.These parameters can comprise, and such as, DMRS is to the mapping of the time/frequency resource in the subframe for each signal and synchronizing signal and the sequence that uses for each DMRS and synchronizing signal.
By defining this parameter for all signals according to such as standard or certain signaling, receiver does not need blind search to find DMRS sequence, synchronizing sequence and their mapping whole or multiplely may to combine.Meanwhile, provide the predefine of RS parameter to map and allow to distinguish the DMRS parameter in different beacon, this has advantage in Combined estimator performance and interference randomization.In one example, DMRS sequence is at least the function of the resource index (such as, PRB index) that respective signal is launched wherein.In other example, DMRS mapping parameters (such as, DMRS notation index) is at least the function of the resource index (such as, PRB index) that respective signal is launched wherein.
Fig. 2 b, 2c and 2d provide the example of the DMRS resource mapping of the function as signal resource index.In Fig. 2 b and 2c, can by such as comparing DMRS{A1, the phase place of B1, A2, B2} obtains rough Frequency Estimation, and but DMRS{A1, B1, A2, B2} closely separate in couples in time and therefore have wide Frequency Estimation scope poor accuracy.Similarly, can { A1, B1, A2, B2} obtain rough timing estimation by combining consideration.After rough time and Frequency Estimation, if needed, by coming the timing of estimated signal A and frequency based on A1, A2 and coming timing and the frequency of estimated signal B based on B1, B2, accuracy of estimation can increase further.
In other example, DMRS sequence and/or map the function of other parameters being at least community ID or cluster identity and/or system bandwidth or joining with signal correction.
Embodiment herein also relates to a kind of receiver, and this receiver is adapted to estimate the first yardstick characteristic of channel be associated with the first channel of the first transmitter and the second largest yardstick characteristic of channel be associated with the second channel of the second transmitter.
The exemplary embodiment of this receiver is described referring now to Fig. 3.Fig. 3 be according to a kind of exemplary embodiment be adapted to estimate the first yardstick characteristic of channel that is associated with the first channel leading to the first transmitter and the block diagram of the receiver of the second largest yardstick characteristic of channel be associated with the second channel of the second transmitter.
Fig. 3 illustrates the receiver 300 comprising receiving element 304, receiving element 304 is adapted to receive by the first signal of the first transmitter 320a transmitting and is further used at least receiving the secondary signal of being launched by the second transmitter 320b, wherein the first and second transmitters are synchronized to common reference synchronization, and wherein the first signal and/or secondary signal comprise at least one reference signal.Receiver 300 comprises further: estimation unit 305, is adapted to carry out the Combined estimator first and second large scale characteristic of channel based on this at least one reference signal; And associative cell 306, be adapted to the large scale characteristic of channel of Combined estimator to be associated with the first channel of being associated with the first transmitter 320a and be associated with the second channel be associated with the second transmitter 320b.
This receiver has the advantage identical with the method performed by this receiver.A kind of advantage is, this receiver by also considering the reference signal of other (multiple) signals received except the first received signal, can improve the estimation of the large scale characteristic of channel joined with the first received signal correction.Another advantage is, transmitter can not need in order to this receiver can be estimated as many reference signal to be incorporated into the large scale characteristic of channel signal correction be launched joined by the signal that is launched rightly.
According to a kind of embodiment, receiver 300 comprises further: lock unit 307, and the large scale characteristic of channel be adapted to based on associated Combined estimator is synchronous with the first transmitter 320a by receiver 300.
According to another embodiment, receiver 300 comprises further: determining unit 308, and the large scale characteristic of channel be adapted to based on associated Combined estimator determines reference synchronization.
According to an embodiment again, the first and second large scale characteristics of channel comprise following one or more: postpone expansion, Doppler's diffusion, Doppler frequency shift, average gain and average retardation.
According to a kind of embodiment, estimation unit 305 is adapted to timing and/or the Frequency Synchronization of estimation first signal further, so that lock unit 307 is synchronous with the first transmitter 320a by receiver 300.
According to another embodiment, receiver 300 comprises further: demodulating unit 309, is adapted to the data of launching by utilizing the joint channel estimation of the described first and second large scale characteristics of channel to come demodulation first and/or second transmitter 320a, 320b.
According to an embodiment again, determining unit 308 be adapted to further based on pre-configured, based on the signaling received from network or transmitter or based on the analysis to received first and at least secondary signal, determine that some the large scale characteristic joined with some signal correction is identical.
In figure 3, receiver 300 is also illustrated as to comprise and receives layout 301 and launch layout 302.By these two layouts, receiver 300 is adapted to be and communicates with other nodes in cordless communication network and/or entity.Receive layout 301 and can comprise more than one reception layout.Such as, receive layout and can be connected to electric wire and antenna, by means of this, receiver 300 can be communicated with other nodes in cordless communication network and/or entity.Similarly, launch layout 302 and can comprise more than one transmitting layout, this more than one transmitting is arranged and then is connected to electric wire and antenna, by means of this, receiver 300 can be communicated with other nodes in cordless communication network and/or entity.Receiver 300 comprises the memory 303 for storing data further.Further, receiver 300 is illustrated as and comprises control or processing unit 310, controls or processing unit 310 and then be connected to different unit 304-309.It is noted that this be a kind of illustrated examples and receiver 300 can comprise adopt with in Fig. 3 illustrated in the identical mode of unit to perform the more, less of the function of receiver 300 or other unit or module.
It should be noted that Fig. 3 only illustrates the various functional units in receiver 300 in the meaning of logic.In practice, any applicable software and hardware device/circuit etc. can be used to implement these functions.Therefore, these embodiments are generally not restricted to shown structure and these functional units of receiver 300.Therefore, previously described exemplary embodiment can be realized by many modes.Such as, an embodiment comprises computer-readable medium, and this computer-readable medium has instruction stored thereon, and these instructions are by control or processing unit 310 can perform method step for performing in receiver 300.Can be performed by computing system and be stored these instructions on a computer-readable medium perform as in claim the method step of receiver 300 of setting forth.
Fig. 4 schematically shows a kind of embodiment of the layout in receiver 400.Herein, included by receiver 400 is processing unit 406, and such as it has DSP (digital signal processor).Processing unit 406 can be the individual unit of the different actions performing process described herein or multiple unit.Receiver 400 can also comprise for the input unit 402 from other entity Received signal strength and for providing the output unit 404 of (multiple) signal to other entities.This input unit and this output unit can be arranged to integrated entity, or as illustrated in the example of Fig. 3, are arranged to one or more interface 301/302.
In addition, receiver 400 comprises at least one computer program 408, and it adopts the form of nonvolatile memory, such as, and EEPROM (Electrically Erasable Read Only Memory), flash memory and hard drives.Computer program 408 comprises computer program 410, computer program 410 comprises code device, when being performed in the processing unit 406 of this code device in receiver 400, receiver 400 is impelled to perform the action of such as previous process described by composition graphs 1a-1c.
Computer program 410 can be configured to the computer program code be structured in computer program module 410a-410e.Therefore, in a kind of exemplary embodiment, code device in the computer program of receiver 400 comprises: receiving element or module, for receiving by the first signal of the first transmitter transmitting and at least receiving the secondary signal of being launched by the second transmitter further, wherein the first and second transmitters are synchronized to common reference synchronization, and wherein the first signal and/or secondary signal comprise at least one reference signal.This computer program comprises further: estimation unit or module, for carrying out the Combined estimator first and second large scale characteristic of channel based on this at least one reference signal.This computer program comprises further: assignment unit or module, for the large scale characteristic of channel of Combined estimator being assigned to the first channel of being associated with the first transmitter and being assigned to the second channel be associated with the second transmitter.
The action that these computer program modules can perform in fact flow process illustrated in Fig. 1 a-1c carrys out simulated receiver 400.In other words, when different computer program modules is performed in processing unit 406, they can correspond to the unit 304-309 of Fig. 3.
Although the code device above in composition graphs 3 the disclosed embodiments is implemented as computer program module, these computer program modules impel receiver to perform in conjunction with accompanying drawing mentioned above in action as described above when being performed in corresponding processing unit, but at least one code device can be implemented as hardware circuit in an alternate embodiment at least in part.
Processor can be single cpu (CPU), but also can comprise two or more processing units.Such as, processor can comprise general object microprocessor; Instruction set processor and/or relevant chipset and/or specific purposes microprocessor, such as ASIC (application-specific integrated circuit (ASIC)).Processor can also comprise memory on the plate of buffer memory object.Computer program can be carried by the computer program being connected to processor.Computer program can comprise computer-readable medium, and computer program is stored on the computer-readable medium.Such as, computer program can be flash memory, RAM (random access storage device), ROM (read-only memory) or EEPROM, and computer program module as described above can be distributed on the different computer programs of employing form of memory in receiver in an alternate embodiment.
To understand, in present disclosure to interactive unit choose and to the name of these unit only for exemplary purpose, and in order to advised process action can be performed, can configure by multiple substitute mode the node being suitable for any method performed in method as described above.
Shall also be noted that unit described in this disclosure will be regarded as logic entity and must not be regarded as the physical entity of separation.
Although describe embodiment according to some embodiments, institute it is contemplated that, once reading specification and study accompanying drawing, the alternative of these embodiments, amendment, arrangement and equivalent will become obvious.Therefore, it is intended that following claims comprise drop on embodiment and these alternatives in the scope defined by unsettled claim, amendment, arrangement and equivalent.
Claims (16)
1. one kind is performed the method (100) of the first yardstick characteristic of channel be associated with the first channel leading to the first transmitter for estimation and the second largest yardstick characteristic of channel be associated with the second channel leading to the second transmitter by receiver, and described method comprises:
-receive (110) by described first transmitter launch the first signal and at least receive further by described second transmitter launch secondary signal, wherein said first transmitter and described second transmitter are synchronized to common reference synchronization, and wherein said first signal and/or described secondary signal comprise at least one reference signal;
-come the described first yardstick characteristic of channel of Combined estimator (120) and the described second largest yardstick characteristic of channel based at least one reference signal described; And
-the described large scale characteristic of channel of Combined estimator association (130) is associated with to described first channel be associated with described first transmitter the described second channel be associated with described second transmitter.
2. method according to claim 1 (100), comprises further: based on the large scale characteristic of channel of associated Combined estimator, by described receiver synchronous with described first transmitter (150).
3. method according to claim 2 (100), comprising: the large scale characteristic of channel based on associated Combined estimator determines (140) reference synchronization.
4. the method (100) according to any one of claim 1-3, the wherein said first yardstick characteristic of channel and the described second largest yardstick characteristic of channel comprise following one or more: postpone expansion, doppler spread, Doppler frequency shift, average gain and average retardation.
5. according to claim 2 or method according to claim 3 (100), wherein described receiver synchronous with described first transmitter (150) being comprised: timing and/or the Frequency Synchronization of estimating described first signal.
6. the method (100) according to the aforementioned claim of any one, wherein utilizes the joint channel estimation of the described first yardstick characteristic of channel and the described second largest yardstick characteristic of channel to perform demodulation to the data that described first transmitter and/or described second transmitter are launched.
7. the method (100) according to any one of claim 1-6, comprise further: based on pre-configured, based on the signaling received from network or transmitter or based on the analysis to the first received signal and at least secondary signal, determine that some the large scale characteristic joined with some signal correction is identical.
8. a receiver (300), the second largest yardstick characteristic of channel that the second channel that described receiver (300) is adapted to estimate the first yardstick characteristic of channel that is associated with the first channel leading to the first transmitter (320a) and lead to the second transmitter (320b) is associated, described receiver (300) comprising:
-receiving element (304), be adapted to receive the first signal of being launched by described first transmitter (320a) and be further used at least receiving the secondary signal of being launched by described second transmitter (320b), wherein said first transmitter and described second transmitter are synchronized to common reference synchronization, and wherein said first signal and/or described secondary signal comprise at least one reference signal;
-estimation unit (305), is adapted to come the first yardstick characteristic of channel described in Combined estimator and the described second largest yardstick characteristic of channel based at least one reference signal described; And-associative cell (306), be adapted to the described large scale characteristic of channel of Combined estimator to be associated with described first channel that is associated with the first transmitter (320a) and be associated with the described second channel be associated with described second transmitter (320b).
9. receiver according to claim 8 (300), comprise further: lock unit (307), be adapted to the large scale characteristic of channel based on associated Combined estimator, described receiver (300) is synchronous with described first transmitter (320a).
10. receiver according to claim 9 (300), comprises further: determining unit (308), and the large scale characteristic of channel be adapted to based on associated Combined estimator determines reference synchronization.
11. receivers (300) according to Claim 8 according to any one of-10, the wherein said first yardstick characteristic of channel and the described second largest yardstick characteristic of channel comprise following one or more: postpone expansion, doppler spread, Doppler frequency shift, average gain and average retardation.
12. according to claim 9 or receiver according to claim 11 (300), wherein said estimation unit (305) is adapted to timing and/or the Frequency Synchronization of estimating described first signal further, so that described lock unit (307) is synchronous with described first transmitter (320a) by described receiver (300).
13. receivers (300) according to the aforementioned claim of any one, comprising further: demodulating unit (309), being adapted to the data of launching by utilizing the joint channel estimation of the described first yardstick characteristic of channel and the described second largest yardstick characteristic of channel to come the first transmitter described in demodulation and/or described second transmitter (320a, 320b).
14. receivers (300) according to the aforementioned claim of any one, wherein said determining unit (308) be adapted to further based on pre-configured, based on the signaling received from network or transmitter or based on the analysis to the first received signal and at least secondary signal, determine that some the large scale characteristic joined with some signal correction is identical.
15. 1 kinds of computer programs (410), comprise computer-readable code means, when running in processing unit (406) included in the layout of described computer-readable code means in the receiver (300,300) according to Claim 8 described in-14, impel the corresponding method of described receiver (300,300) execution according to claim 1-7.
16. 1 kinds of computer programs (408), comprise computer program according to claim 15 (410).
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| PCT/SE2013/051121 WO2015047141A1 (en) | 2013-09-27 | 2013-09-27 | A receivier and method for estimating large-scale channel properties |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN105580455A true CN105580455A (en) | 2016-05-11 |
| CN105580455B CN105580455B (en) | 2020-03-06 |
Family
ID=52744085
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201380079767.1A Expired - Fee Related CN105580455B (en) | 2013-09-27 | 2013-09-27 | Receiver and method for estimating large scale channel characteristics |
Country Status (4)
| Country | Link |
|---|---|
| US (1) | US10284393B2 (en) |
| EP (1) | EP3050373B1 (en) |
| CN (1) | CN105580455B (en) |
| WO (1) | WO2015047141A1 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114142984A (en) * | 2016-08-24 | 2022-03-04 | 高通股份有限公司 | Method, apparatus, and computer-readable medium for wireless communication |
Families Citing this family (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| SG11201606699XA (en) | 2014-02-13 | 2016-09-29 | Lg Electronics Inc | Method for transmitting/receiving synchronization signal for d2d communication in wireless communication system, and apparatus therefor |
| EP3332588B1 (en) * | 2015-08-19 | 2022-03-16 | Sony Group Corporation | Mobile communications devices and methods |
| WO2018030947A1 (en) * | 2016-08-12 | 2018-02-15 | Telefonaktiebolaget Lm Ericsson (Publ) | Reducing overhead in sidelink transmissions |
| CN109565769B (en) * | 2016-08-12 | 2021-06-25 | 瑞典爱立信有限公司 | Method and apparatus for performing device-to-device operations |
| EP3497898A1 (en) * | 2016-08-12 | 2019-06-19 | Telefonaktiebolaget LM Ericsson (publ) | Reducing overhead in sidelink transmissions |
| CN114979973A (en) * | 2016-12-30 | 2022-08-30 | 英特尔公司 | Method and apparatus for radio communication |
| EP4210269A1 (en) | 2017-01-06 | 2023-07-12 | LG Electronics Inc. | Method for transmitting reference signal in wireless communication system and apparatus therefor |
| CN108809587B (en) * | 2017-05-05 | 2021-06-08 | 华为技术有限公司 | Method for determining reference signal sequence, terminal equipment and network equipment |
| US20210204252A1 (en) * | 2019-12-31 | 2021-07-01 | Qualcomm Incorporated | Quasi co-location source selection and indication on sidelink |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102130865A (en) * | 2010-01-13 | 2011-07-20 | 英飞凌科技股份有限公司 | Radio receiver and method for channel estimation |
| US20130064168A1 (en) * | 2009-08-12 | 2013-03-14 | Research In Motion Limited | Physical Uplink Shared Channel Demodulation Reference Signal Design for Uplink Coordinated Transmission in Type II Relay Using a Punctured Demodulation Reference Signal |
| US20130188558A1 (en) * | 2012-01-19 | 2013-07-25 | Samsung Electronics Co, Ltd | Apparatus and method for pilot scrambling for enhanced physical downlink control channels |
| US20130194931A1 (en) * | 2012-01-27 | 2013-08-01 | Interdigital Patent Holdings, Inc. | Systems and/or methods for providing epdcch in a multiple carrier based and/or quasi-collated network |
| US20130201840A1 (en) * | 2012-02-03 | 2013-08-08 | Telefonaktiebolaget L M Ericsson (Publ) | Methods and arrangements for channel estimation |
| US20130244676A1 (en) * | 2012-03-19 | 2013-09-19 | Renesas Mobile Corporation | Methods, apparatus and computer programs for configuring user equipment |
Family Cites Families (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6765969B1 (en) * | 1999-09-01 | 2004-07-20 | Motorola, Inc. | Method and device for multi-user channel estimation |
| EP1843484A1 (en) * | 2006-04-03 | 2007-10-10 | Nokia Siemens Networks Gmbh & Co. Kg | Method for data transmission in a radio communication system as well as radio station and radio communications system |
| US8660200B2 (en) * | 2007-08-15 | 2014-02-25 | Bhaskar Patel | Dual-pass joint channel estimation and data demodulation for OFDM systems |
| IL204790A (en) * | 2010-03-28 | 2014-07-31 | Airgreen Ltd | Method of processing and drying waste in a cyclic continuous process |
| EP2678769B1 (en) * | 2011-02-23 | 2017-01-04 | ST-Ericsson SA | A device controller for a memory device |
| EP2710489A4 (en) * | 2011-05-19 | 2014-10-29 | Crane Merchandising Sys Inc | Customer usage statistics gathering within vending machines |
| WO2013070549A1 (en) * | 2011-11-08 | 2013-05-16 | Marvell World Trade Ltd. | Methods and apparatus for mitigating known interference |
| US9203576B2 (en) * | 2012-08-03 | 2015-12-01 | Telefonaktiebolaget L M Ericsson (Publ) | Quasi co-located antenna ports for channel estimation |
| US10396960B2 (en) * | 2012-08-06 | 2019-08-27 | Kt Corporation | Method for transmitting control information on transmission points and corresponding transmission point, as well as method for mapping uplink control channel resource of terminal and corresponding terminal |
| WO2014027948A1 (en) * | 2012-08-13 | 2014-02-20 | Telefonaktiebolaget L M Ericsson (Publ) | Method and apparatus for reference signal transmission and reception |
| US9769807B2 (en) | 2012-09-28 | 2017-09-19 | Telefonaktiebolaget Lm Ericsson (Publ) | User equipment, radio network node and methods therein |
| CN104813602B (en) * | 2013-01-03 | 2018-08-07 | 英特尔公司 | For the cross-carrier accurate device and method with bit signaling in new carrier type (NCT) wireless network |
| CN104956743B (en) * | 2013-01-31 | 2018-10-26 | Lg 电子株式会社 | Synchronous method and apparatus is executed in a wireless communication system |
| US10117490B2 (en) * | 2013-07-19 | 2018-11-06 | Michelle Lyn Singer | Compositions and methods for making hair buns |
-
2013
- 2013-09-27 WO PCT/SE2013/051121 patent/WO2015047141A1/en active Application Filing
- 2013-09-27 CN CN201380079767.1A patent/CN105580455B/en not_active Expired - Fee Related
- 2013-09-27 EP EP13894224.8A patent/EP3050373B1/en active Active
- 2013-09-27 US US15/024,322 patent/US10284393B2/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20130064168A1 (en) * | 2009-08-12 | 2013-03-14 | Research In Motion Limited | Physical Uplink Shared Channel Demodulation Reference Signal Design for Uplink Coordinated Transmission in Type II Relay Using a Punctured Demodulation Reference Signal |
| CN102130865A (en) * | 2010-01-13 | 2011-07-20 | 英飞凌科技股份有限公司 | Radio receiver and method for channel estimation |
| US20130188558A1 (en) * | 2012-01-19 | 2013-07-25 | Samsung Electronics Co, Ltd | Apparatus and method for pilot scrambling for enhanced physical downlink control channels |
| US20130194931A1 (en) * | 2012-01-27 | 2013-08-01 | Interdigital Patent Holdings, Inc. | Systems and/or methods for providing epdcch in a multiple carrier based and/or quasi-collated network |
| US20130201840A1 (en) * | 2012-02-03 | 2013-08-08 | Telefonaktiebolaget L M Ericsson (Publ) | Methods and arrangements for channel estimation |
| US20130244676A1 (en) * | 2012-03-19 | 2013-09-19 | Renesas Mobile Corporation | Methods, apparatus and computer programs for configuring user equipment |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114142984A (en) * | 2016-08-24 | 2022-03-04 | 高通股份有限公司 | Method, apparatus, and computer-readable medium for wireless communication |
Also Published As
| Publication number | Publication date |
|---|---|
| CN105580455B (en) | 2020-03-06 |
| EP3050373A4 (en) | 2017-06-14 |
| EP3050373A1 (en) | 2016-08-03 |
| US20160241420A1 (en) | 2016-08-18 |
| EP3050373B1 (en) | 2021-07-21 |
| US10284393B2 (en) | 2019-05-07 |
| WO2015047141A1 (en) | 2015-04-02 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN111295914B (en) | Method for transmitting positioning information by terminal in wireless communication system supporting sidelink and apparatus therefor | |
| CN105580455A (en) | A receivier and method for estimating large-scale channel properties | |
| US10411930B2 (en) | Method and apparatus for transmitting positioning reference signal in wireless communication system | |
| US10021555B2 (en) | Method and apparatus for proximity discovery for device-to-device communication | |
| KR102080118B1 (en) | Enhanced Positioning Reference Signal Patterns for Positioning | |
| CN107439033B (en) | Method of performing ranging related operations in wireless communication system | |
| US10944596B2 (en) | RRM measurement and channel estimation based on reference signals of coexisting communication systems | |
| US20170164388A1 (en) | Methods and Wireless Devices for Enabling Synchronization in D2D Communications | |
| US20140254429A1 (en) | Signaling for device-to-device wireless communication | |
| WO2014048209A1 (en) | Method, system, and apparatus for notifying and determining antenna port position relationship | |
| KR20190075076A (en) | Synchronization Signal Design | |
| GB2497740A (en) | Mapping of discovery channel to a control channel in a device to device network | |
| KR101710289B1 (en) | Method and device for transmitting discovery signal | |
| US10470147B2 (en) | Method for executing RSTD measurement-related operation in wireless communication system | |
| US20230188398A1 (en) | Apparatus and method for a wireless communication system employing cyclic shift hopping | |
| US20180324719A1 (en) | Physical channel configuration method, base station and user equipment | |
| US20180324731A1 (en) | Physical channel configuration method, base station and user equipment | |
| US20160270010A1 (en) | Methods and wireless devices for enabling d2d communications in a wireless network | |
| WO2013155680A1 (en) | Mechanism for controlling discovery of small cells | |
| CN107113578A (en) | A kind of method and device of narrowband systems synchronization or broadcast | |
| KR20230103005A (en) | Method and apparatus for performing sidelink positioning based on srs in wireless communication system | |
| CN116636278A (en) | Signal processing method, device, equipment and storage medium |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20200306 |